spec: kdump/ppc64: make servicelog_notify silent when there are no errors
    
    Resolves: bz2165018
    Upstream: Fedora Rawhide
    Conflict: None
    
    commit daa829f79e308e9d53060331f7721d3ee6b9f549
    Author: Lichen Liu <lichliu@redhat.com>
    Date:   Mon Jun 12 17:17:43 2023 +0800
    
        spec: kdump/ppc64: make servicelog_notify silent when there are no errors
    
        There is confusing message in /var/log/anaconda/packaging.log when installing
        kexec-tools during the system installation on ppc64le:
    
                Event Notification Registration successful (id: 1)
    
        Make servicelog_notify slient when there are no erros.
    
        Signed-off-by: Lichen Liu <lichliu@redhat.com>
        Reviewed-by: Coiby Xu <coxu@redhat.com>
    
    Signed-off-by: Lichen Liu <lichliu@redhat.com>